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Rajat makes 8 open cones of height 24 cm and slant height 25 cm from a sheet of thick paper. Find the area of the sheet.

550 sq. m.
4400 sq. m.
6000 sq. m.
6236 sq.m.
Explanation:

L2 = r2 + h2 = 252 - 242

∴ r = 7 cm

Curved surface area of cone = 3.142 x 7 x 25 = 550 sq.m.

Since the cone is open, it means, it just has curved surface.One sheet can make 8 cones.

So area of one sheet = Curved surface area of 8 cones = 8 x 550

∴ Area of one sheet = 4400 sq.cm.
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